Viagra

A woman went to an old folks home to see her grandfather,she asked him how he was and if he was able to sleep at night and he said “fine thanks to the viagra and cocoa they give us every night.
The grandaughter was very worried her grandad was losing it so she went to find a nurse.
“nurse” she said ” I think something is wrong with my grandad. He seems to think you give him some vigagra and cocoa every night before he goes to sleep”.
“that is correct” said the nurse, “I know it may seem strange but it seems to help, we give them the cocoa to help them sleep and the viagra to stop them rolling off the bed.